hw/xen-hvm: Add a mapcache arg to xen_register_ioreq()

Add a mapcache argument to xen_register_ioreq() allowing
the caller to optionally disable the mapcache.

All callers still call it with mapcache = true so there's no
functional change yet.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
4 files changed